1; RUN: opt -S -instcombine < %s | FileCheck %s 2 3; (-0.0 - X) * C => X * -C 4define float @test1(float %x) { 5 %sub = fsub float -0.000000e+00, %x 6 %mul = fmul float %sub, 2.0e+1 7 ret float %mul 8 9; CHECK-LABEL: @test1( 10; CHECK: fmul float %x, -2.000000e+01 11} 12 13; (0.0 - X) * C => X * -C 14define float @test2(float %x) { 15 %sub = fsub nsz float 0.000000e+00, %x 16 %mul = fmul float %sub, 2.0e+1 17 ret float %mul 18 19; CHECK-LABEL: @test2( 20; CHECK: fmul float %x, -2.000000e+01 21} 22 23; (-0.0 - X) * (-0.0 - Y) => X * Y 24define float @test3(float %x, float %y) { 25 %sub1 = fsub float -0.000000e+00, %x 26 %sub2 = fsub float -0.000000e+00, %y 27 %mul = fmul float %sub1, %sub2 28 ret float %mul 29; CHECK-LABEL: @test3( 30; CHECK: fmul float %x, %y 31} 32 33; (0.0 - X) * (0.0 - Y) => X * Y 34define float @test4(float %x, float %y) { 35 %sub1 = fsub nsz float 0.000000e+00, %x 36 %sub2 = fsub nsz float 0.000000e+00, %y 37 %mul = fmul float %sub1, %sub2 38 ret float %mul 39; CHECK-LABEL: @test4( 40; CHECK: fmul float %x, %y 41} 42 43; (-0.0 - X) * Y => -0.0 - (X * Y) 44define float @test5(float %x, float %y) { 45 %sub1 = fsub float -0.000000e+00, %x 46 %mul = fmul float %sub1, %y 47 ret float %mul 48; CHECK-LABEL: @test5( 49; CHECK: %1 = fmul float %x, %y 50; CHECK: %mul = fsub float -0.000000e+00, %1 51} 52 53; (0.0 - X) * Y => 0.0 - (X * Y) 54define float @test6(float %x, float %y) { 55 %sub1 = fsub nsz float 0.000000e+00, %x 56 %mul = fmul float %sub1, %y 57 ret float %mul 58; CHECK-LABEL: @test6( 59; CHECK: %1 = fmul float %x, %y 60; CHECK: %mul = fsub float -0.000000e+00, %1 61} 62 63; "(-0.0 - X) * Y => -0.0 - (X * Y)" is disabled if expression "-0.0 - X" 64; has multiple uses. 65define float @test7(float %x, float %y) { 66 %sub1 = fsub float -0.000000e+00, %x 67 %mul = fmul float %sub1, %y 68 %mul2 = fmul float %mul, %sub1 69 ret float %mul2 70; CHECK-LABEL: @test7( 71; CHECK: fsub float -0.000000e+00, %x 72} 73 74; Don't crash when attempting to cast a constant FMul to an instruction. 75define void @test8(i32* %inout) { 76entry: 77 %0 = load i32* %inout, align 4 78 %conv = uitofp i32 %0 to float 79 %vecinit = insertelement <4 x float> <float 0.000000e+00, float 0.000000e+00, float 0.000000e+00, float undef>, float %conv, i32 3 80 %sub = fsub <4 x float> <float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00>, %vecinit 81 %1 = shufflevector <4 x float> %sub, <4 x float> undef, <4 x i32> <i32 1, i32 1, i32 1, i32 1> 82 %mul = fmul <4 x float> zeroinitializer, %1 83 br label %for.cond 84 85for.cond: ; preds = %for.body, %entry 86 %local_var_7.0 = phi <4 x float> [ %mul, %entry ], [ %2, %for.body ] 87 br i1 undef, label %for.body, label %for.end 88 89for.body: ; preds = %for.cond 90 %2 = insertelement <4 x float> %local_var_7.0, float 0.000000e+00, i32 2 91 br label %for.cond 92 93for.end: ; preds = %for.cond 94 ret void 95} 96